the answer is -$97 for sure.
$ a' t& D8 Z8 R+ }* FTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Think about it this way tvb now,tvbnow,bttvb! }) g. b0 {1 n8 |3 u
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
: m+ ^7 _- j, T- c% _ `! H) Z2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
| 
發表於 2007-5-19 03:21 PM
| 
發表於 2007-5-21 03:49 AM
| 